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Isotopic substitution of boron and carbon in superconducting diamond epilayers grown by MPCVD
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SYSNO ASEP 0346854 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Isotopic substitution of boron and carbon in superconducting diamond epilayers grown by MPCVD Author(s) Achatz, P. (FR)
Omnès, F. (FR)
Ortega, L. (FR)
Marcenat, C. (FR)
Vacík, Jiří (UJF-V) RID, ORCID, SAI
Hnatowicz, Vladimír (UJF-V) RID
Koster, U. (FR)
Jomard, F. (FR)
Bustarret, E. (FR)Source Title Diamond and Related Materials. - : Elsevier - ISSN 0925-9635
Roč. 19, č. 7 (2010), s. 814-817Number of pages 4 s. Language eng - English Country CH - Switzerland Keywords Isotopic effects ; Vibrational properties ; p-type doping Subject RIV BM - Solid Matter Physics ; Magnetism R&D Projects KAN400480701 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z10480505 - UJF-V (2005-2011) UT WOS 000279229700025 DOI 10.1016/j.diamond.2010.01.052 Annotation Sets of heavily boron-doped {100}-oriented diamond epilayers have been grown by MPCVD from isotope-enriched gases such as (CH4)-C-13 and (B2H6)-B-10 or (CH4)-C-13 and naturally abundant (B2H6)-B-11, and the resulting concentration profiles of the various boron isotopes were measured by SIMS. In the particular case of the (CB)-C-13-B-10 set, the high absorption cross section of B-10 made neutron depth profiling possible for this element. The vibrational and superconducting properties of these epilayers were compared to those of films grown from gases containing the isotopes in their natural abundance. The critical temperature T-c values were found to be lower both in the (CB)-C-13-B-11 and (CB)-C-13-B-10 sets, as expected for a conventional pairing mechanism mediated by phonons. In good agreement with recent studies, the isotope-effect coefficient for Tc was found to be much higher than the classical 0.5 value. Various origins for this behaviour are suggested. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2011
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